Ryan Callaghan joins Jason Phelps in southwest Washington to shed light on treponeme-associated hoof disease (TAHD). Once only thought to affect sheep, goats, and cows, Hoof Disease has been detected in elk since 2008 and is slowly spreading east, which should be of concern to hunters across the west. After a long muzzleloader season, Jason unintentionally bags an infected elk, then accompanies Cal with an archery hunt. Afterwards, Cal joins Dr. Margaret Wild at a WSU Pullman research facility to find out the current state of the disease, what researchers are learning, and what hunters can and need to do to help.